<?php
  $client_pass = '***';
  $data['action'] = 'SALE';
  $data['client_key'] = '***';
  $data['order_id'] = '546-4588';
  $data['order_amount'] = '10001.00';
  $data['order_currency'] = 'UAH';
  $data['order_description'] = 'test';
  $data['channel_id'] = 'VERIFY_ZERO';
  $data[card_number'] = '4111111111111111';
  $data['card_cvv2'] = '159';
  $data['card_exp_month'] = '01';
  $data['card_exp_year'] = '2022';
  $data['payer_first_name'] = 'Ivan';
  $data['payer_last_name'] = 'Ivanov';
  $data['payer_phone'] = '380111111111';
  $data['payer_address'] = 'NA';
  $data['payer_country'] = 'UA';
  $data['payer_state'] = 'NA';
  $data['payer_city'] = 'Kiev';
  $data['payer_zip'] = '01001';
  $data['payer_email'] = 'sale@gmail.com';
  $data['payer_ip'] = '213.186.115.164';
  $data['req_token'] = 'N';
  $data['recurring_init'] = 'N';
  $data['term_url_3ds'] = 'https://google.com';
  $hash = md5(
            strtoupper(
              strrev(
                $data['payer_email']).
                ($client_pass).
                strrev(
                  substr($card$data[card_number'],0,6).
                  substr($card$data[card_number'],-4)
                )
              )
            );
?>

$url = 'https://secure.platononline.com/post-unq/';
  $crq = curl_init();
    curl_setopt($crq, CURLOPT_URL, $url);
    curl_setopt($crq, CURLOPT_HEADER, 0);
    curl_setopt($crq, CURLOPT_POST, 1);
    curl_setopt($crq, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($crq, CURLOPT_SSL_VERIFYHOST, 0);
    curl_setopt($crq, CURLOPT_SSL_VERIFYPEER, 0);
    curl_setopt($crq, CURLOPT_POSTFIELDS, http_build_query($data));
  $result = curl_exec($crq);
  if (curl_errno($crq)) {
    echo 'ERROR: '.curl_error($crq);
  }else{
    echo $result;
  }
  curl_close($crq);